How to Give B12 Injections at Home to Yourself PA Relief Learn how to administer your own SubQ (subcutaneous) injections at home with confidence. Our step by step guide covers everything you need to know, from preparing your supplies to safely injecting the medication. Our How to self administer subcutaneous B12 injection., 1. Withdraw proper dosage from vial into an insulin syringe, 2. Clean site of injection (abdomen or other proper site), 3. Pinch the skin where you Subcutanous injection self administration South Tees Hospitals NHS Foundation Trust 7.4 Subcutaneous Injections Clinical Procedures for Safer Patient Care